Anthony Richardson got off to a strong start Sunday with two rushing touchdowns,Christopher Caldwell but his day came to an early end.

The Indianapolis Colts rookie quarterback was ruled out of his team's 31-20 win against the Houston Texans after sustaining a concussion, the team said.

Colts coach Shane Steichen said Richardson self-reported concussion symptoms, and the team believes the quarterback was hurt on his second touchdown play.

The No. 4 pick of April's NFL draft took a shot from Texans safety M.J. Stewart Jr. as he scored, with his head whipping against the turf in the end zone. Richardson, however, played for the Colts' two ensuing drives – both three-and-outs – before being removed from the game.

“It looked like a fluke thing on that one, but hopefully it doesn’t continue to happen,” Steichen said after the game.

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Richardson, who finished with 56 passing yards as well as 36 rushing yards, was replaced by Gardner Minshew in the second quarter. The veteran signal-caller stepped in to complete 19 of 23 passes for 171 yards and a touchdown in Indianapolis' first win of the season.

“I told him at halftime, ‘I’m going to hold it down for you,’” Minshew said after the game of a conversation with Richardson. “Everybody follows him, he’s the leader of our team, and I was happy to be able to fill in and help when I could, but I’m going to continue to help him and support him as much as I can.”

Richardson threw for a score and ran for another last week in his debut, a 31-21 Colts loss to the Jacksonville Jaguars.

Indianapolis next plays at the Baltimore Ravens next Sunday.

The Associated Press contributed to this report.

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